Quantitative Aptitude
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Percentage & Averages
Question
28 out of 30
The average age of 30 students is 9 years. If the age of their teacher is included, it becomes 10 years. The age of the teacher is
A  27 years 
B  31 years 
C  35 years 
D  40 years 
E  None of these

Ans. D Age of teacher = 10 + 30 = 40
Percentage & Averages Flashcard List
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